Black cream cheese... that's a new one. The alternative is tons of black food color that will stain everyone's teeth - not a great look unless there's a zombie theme or something.
Yes, it's possible to make velvet cakes in any color, but you would probably want to leave the cocoa out to get truer colors.
Isn't the whole point of red velvet that it is, well, red? :-s
How about a black velvet cake with rainbow colored icing as filling?
Here is a recipe I found for black velvet (although I am sure any red velvet recipe could easily be adapted to suit whatever color you wish)
http://iambaker.net/black-velvet-cake/
may I heed one small warning regarding heavily colored cakes....you may want to warn the consumers of said dyed cake that their potty color *may* be altered significantly from the dye in the cake. (I get that it isn't exactly the best thing to lead with when talking up your cake) I only say this because I once made blue velvet, and I had a small panic attack the following day while changing my lil ones diaper when it revealed a very vibrantly colored, smelly suprise. I had totally forgotten that kiddo ate a piece of blue velvet cake...now I know to not be alarmed.
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